The Horse Owner's Guide to Fly Control

Summer is here, and so are the flies. A solid fly control plan combines a clean barn, smart turnout timing, the right spray, and a little protective gear. Here's how to put one together for your horse.

Why Fly Control Actually Matters

Flies are more than annoying. Bites and midge bites are the leading cause of equine dermatitis, also known as sweet itch, an allergic skin reaction that shows up most often on the face and ears. Biting flies and gnats can also spread pigeon fever, equine infectious anemia, and summer sores. A horse left unprotected can come in from the field with bites, welts, and a bad attitude to match.

Keep the Barn Area Clean

Flies breed where there's mess, so start here:

• Move the manure pile. A pile too close to the barn or arena is a fly magnet. If you can, have it hauled off or check with your local agriculture agent about safely spreading it on pasture.

• Eliminate standing water. Stagnant buckets and water stores breed mosquitoes along with flies.

• Switch to pelleted feed where you can. Sweet feed's molasses content draws flies, and any pan or scoop that touches it becomes a fly magnet too.

• Clean buckets and feed pans regularly. This also encourages your horse to drink more, which matters even more in summer heat.

Time Turnout Around the Bugs

Black flies are most active during the day, so many barns flip the schedule: horses inside under fans during daylight hours, turned out at night when it's cooler and the bugs are less active. Most biting insects aren't strong flyers, so steady airflow in the barn does double duty, keeping horses cool and making it harder for flies to land. Look for barn fans built for the job: fully enclosed motors, sealed bearings, and a thermostatic shutoff in case of overheating.

Pick the Right Fly Spray

Fly spray aisles are crowded, so here's how we'd narrow it down:

• UltraShield EX is our go-to all-purpose pick. It's weatherproof and sweat-resistant, with up to 17 days of protection against flies, mosquitoes, ticks, and gnats.

• Endure Gold is a strong choice if you want fast-acting, longer-lasting protection backed by newer EPA-approved active ingredients.

• Equiderma Natural Horse Spray is the one we point "natural folk" toward. It's a neem and aloe based formula with no harsh chemicals, a good fit for sensitive-skinned horses.

Add Repellent Horse Clothing

Fly sheets and masks give your horse round-the-clock protection that doesn't wear off the way sprays can.

For fly sheets, our two go-to picks are the WeatherBeeta ComFiTec Airflow Detach-A-Neck, a lightweight, open-weave sheet built for hot days, and the Shire's Tempest Fly Sheet, a reliable mesh option that's an easy entry point if you're outfitting more than one horse.

For a fly mask, the Cashel Crusader Fly Mask is our most dependable option: soft micromesh, a comfortable three-hole cap design, and solid coverage for the eyes, ears, and face.

Putting It All Together

No single product solves fly season on its own. A clean barn cuts down the breeding ground, smart turnout timing avoids peak fly activity, the right spray handles what's left, and a fly sheet or mask adds protection that lasts all day. Mix and match based on your horse's sensitivity and your barn's setup, and check in with your vet or farm manager if you're dealing with a horse who reacts badly to bites.

Frequently Asked Questions

What diseases can flies spread to horses? Biting flies and gnats can spread pigeon fever, equine infectious anemia, and summer sores, and their bites are the leading cause of sweet itch (equine dermatitis).

How often should I apply fly spray? This depends on the product. Many sprays, like UltraShield EX, offer multi-day protection (up to 17 days), while lighter natural formulas may need more frequent reapplication, especially after rain or heavy sweating. Always follow the label.

Are fly sheets safe to leave on all day? Yes, most fly sheets are designed for all-day wear in summer heat. Check periodically for rubbing, especially around the shoulders and chest, and remove for grooming and a skin check.

What's the difference between a fly spray and a fly repellent ointment? Sprays cover large areas quickly and are best for the whole body. Ointments, like Swat, are typically used for targeted spots such as wounds or areas prone to irritation, since they offer longer-staying protection in one place.

Looking for more seasonal horse care tips? Check out our posts on tick awareness and leather halter safety, or browse our full fly protection collection for everything mentioned here.